Hellsing (stylized in all caps) is a Japanese manga series written and illustrated by Kouta Hirano. It was serialized in Shōnen Gahōsha's seinen manga magazine Young King OURs from April 1997 to September 2008, with its chapters collected in ten tankōbon volumes. The series chronicles the efforts of the mysterious and secret Hellsing Organization as it combats vampires, ghouls, and other supernatural foes who threaten England. The series was licensed for English language release in North America by Dark Horse Comics. From 2002 to 2006, Hirano released a six-chapter prequel series, Hellsing: The Dawn, in Young King OURs Zōkan (later Young King OURs+ before ceasing publication).
A thirteen-episode anime television series adaptation by Gonzo, directed by Umanosuke Iida and Yasunori Urata, with screenplay by Chiaki J. Konaka, was broadcast on Fuji TV from October 2001 to January 2002. A ten-episode original video animation (OVA), titled Hellsing Ultimate, was produced by Geneon. It followed the manga storyline more closely than the anime series. It was released between February 2006 and December 2012. In North America, both the TV series and the OVA were first licensed by Geneon Entertainment and later by Funimation. Following the announcement that Funimation would be unified under the Crunchyroll brand, both Hellsing and Hellsing Ultimate were moved to the platform in 2022.